Tool for cutting rivet-heads.



Patented Sept. 25, |900.-

T. BROWN. TOUL FOR CUTTING E'IVET HEADS.

Udo Model.)

UNITED STATES PATENT (rrrrf'zir.-

THOMAS BROWN, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO DAVIDA. VVILBERT, OF PITTSBURG, PENNSYLVANIA.

TOOL FOR CUTTING FlIV'ET-'l-IEADS srEcIFIcATIoN forming part of LettersPatent No. 658,337, dated september 25, ie.

Application tiled Deeenber 8j 1899. Serial No. 739,'661. (No model.)

T0 all whom t may concern:

Be it known that I, THOMAS BROWN, `of Allegheny, Pennsylvania, (whosepost-oflice address is No. 615 Preble avenue, Allegheny, in the countyof Allegheny and State of Penusylvania,) have invented a new and usefulImprovement in Tools for Cutting Rivet-Heads, of which the following isa full, clear, and eX- act description, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure l shows in vertical section a rivetcutting tool constructed inaccordance with my invention. Fig. 2 is a side elevation thereof. Fig. 3is a bottom plan view, and Fig. 4 is a horizontal section on the line IVIV of Fig. I.

My invention is designed for end-cutting, especially for cutting theheads of rivets when the rivets are to be removed, though it will beunderstood that it can be employed for cutting other like articles forwhich it may be adapted. n

In the drawings, 2 represents the stem of my improved cutting-tool,having-longitudinal surface grooves 3 3 extending along the stern to itsend.

4 is a sleeve which is fitted removably around the stem, and 5 5 arecutter-bars which are fitted in the grooves. These cutter-bars are heldby a nut 6 or other suitable device, which is screwed upon the stem andbears against the ends of the bars, and also preferably by set-screws 7,which pass through the sleeve. The sleeve 4: is preferably secured tothe stein 2 by screw-threads These bars are arranged around a circularline and project somewhat beyondthe endof the stem, formingamatrix-cavity backed by the sleeve, which preferably also extends beyondthe end of the stern, as shown in Fig. 2. When the parts are assembled,the cutter-bars are, iu effect, held removably in longitudinal socketsextending from the end of the tool and are thus substantially and rmlysecured in place. 1

In cutting the rivet-head the end of the tool is brought down upon therivet, as shown in Fig. 2, and, being rotated, the edges of the cutterswhich engage the rivet-head cut the metal to the diameter of the spacebetween said cutters and leave the rivet free to be withdrawn. It isobvious that the diameter of the said space must be that or less thanthat of the shank of the rivet.

The tool is rapid in its operation, and the ease with which thecutter-bars can be adjusted or removed for sharpening or repairs makesthe device very convenient and useful.

Further, as the shank of the rivet is not injured it may bereused. Theface of the riveted article is not injured, as would be the case if thehead were ground or removed by a chisel.

Within the scope of my invention as defined in the claims theconstruction of the tool may be varied by those skilled in the art,since I. In a tool for cutting rivet-heads, the combination of a stem,removable end cutter-bars mounted around and projecting beyond saidstem, and a stop at the outer side of said bars and level with thecutting edge thereof; substantially as described.

2. In a tool forcutting rivet-heads, the combination of a stem,removable end cutter-bars mounted around and projecting beyond said stemand a sleeve inclosing said cutter-bars, the cutting edge of saidcutter-bars being level with the end of said sleeve; substantiallyk asdescribed.

3. In a tool for cutting rivet-heads, the combination of a stem,removable end cutter-bars mounted in grooves around and projectingbeyond said stem, and a sleeve inclosing said cutter-bars, the cuttingedge of said cutterbars being level with the end of said sleeve;substantially as described.

4. In a tool for cutting rivet-heads, the combination of a stem,removable end cutterbars 'mounted in grooves around and projectingbeyond said stem, a sleeve inclosing said cutter-bars, the cutting edgeof said cutter-bars being level with the end of said sleeve, and

bars; substantially as described.

In testimony whereof I have hereunto set my hand.

THOMAS BROWN.

vWitnesses:

H. M. OoEwIN,

GEO. B. BLEMING.

